EP0495480A2 - Video tape recorder for multi-channel recording - Google Patents
Video tape recorder for multi-channel recording Download PDFInfo
- Publication number
- EP0495480A2 EP0495480A2 EP92100601A EP92100601A EP0495480A2 EP 0495480 A2 EP0495480 A2 EP 0495480A2 EP 92100601 A EP92100601 A EP 92100601A EP 92100601 A EP92100601 A EP 92100601A EP 0495480 A2 EP0495480 A2 EP 0495480A2
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- EP
- European Patent Office
- Prior art keywords
- recording
- signals
- video
- signal
- track
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/008—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires
- G11B5/00813—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires magnetic tapes
- G11B5/00847—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires magnetic tapes on transverse tracks
- G11B5/0086—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires magnetic tapes on transverse tracks using cyclically driven heads providing segmented tracks
- G11B5/00865—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires magnetic tapes on transverse tracks using cyclically driven heads providing segmented tracks for transducing on more than one segment simultaneously
- G11B5/00873—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires magnetic tapes on transverse tracks using cyclically driven heads providing segmented tracks for transducing on more than one segment simultaneously the segments being disposed in different longitudinal zones of the tape
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/02—Control of operating function, e.g. switching from recording to reproducing
- G11B15/12—Masking of heads; circuits for Selecting or switching of heads between operative and inoperative functions or between different operative functions or for selection between operative heads; Masking of beams, e.g. of light beams
- G11B15/125—Masking of heads; circuits for Selecting or switching of heads between operative and inoperative functions or between different operative functions or for selection between operative heads; Masking of beams, e.g. of light beams conditioned by the operating function of the apparatus
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
- G11B15/46—Controlling, regulating, or indicating speed
- G11B15/467—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven
- G11B15/4673—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven by controlling the speed of the tape while the head is rotating
- G11B15/4675—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven by controlling the speed of the tape while the head is rotating with provision for information tracking
- G11B15/4676—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven by controlling the speed of the tape while the head is rotating with provision for information tracking using signals recorded in tracks disposed in parallel with the scanning direction
- G11B15/4677—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven by controlling the speed of the tape while the head is rotating with provision for information tracking using signals recorded in tracks disposed in parallel with the scanning direction using auxiliary signals, i.e. pilot signals
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/008—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires
- G11B5/00813—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires magnetic tapes
- G11B5/00878—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires magnetic tapes transducing different track configurations or formats on the same tape
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/78—Television signal recording using magnetic recording
- H04N5/782—Television signal recording using magnetic recording on tape
- H04N5/7824—Television signal recording using magnetic recording on tape with rotating magnetic heads
- H04N5/7826—Television signal recording using magnetic recording on tape with rotating magnetic heads involving helical scanning of the magnetic tape
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/78—Television signal recording using magnetic recording
- H04N5/782—Television signal recording using magnetic recording on tape
- H04N5/7824—Television signal recording using magnetic recording on tape with rotating magnetic heads
- H04N5/7826—Television signal recording using magnetic recording on tape with rotating magnetic heads involving helical scanning of the magnetic tape
- H04N5/78263—Television signal recording using magnetic recording on tape with rotating magnetic heads involving helical scanning of the magnetic tape for recording on tracks inclined relative to the direction of movement of the tape
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/92—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/92—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N5/9201—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving the multiplexing of an additional signal and the video signal
- H04N5/9205—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving the multiplexing of an additional signal and the video signal the additional signal being at least another television signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/802—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving processing of the sound signal
Definitions
- the invention relates to a video tape recorder (VTR) for recording and reproducing a video signal and an audio signal and, more particularly, to a video tape recorder which can simultaneously record a plurality of video signals and audio signals onto the same tape by a single tape running mechanism and can also reproduce a desired signal.
- VTR video tape recorder
- a field skip As a conventional method of recording a plurality of video signals by one VTR, there is a method called a field skip. For instance, there is JP-A-59-117383.
- Fig. 1 shows a construction of the video tape recorder of the above Official Gazette.
- Video signals given to input terminals 21 and 22 are synchronized by a delay circuit 25 and a control circuit 26.
- a synthesis signal in which the respective input signals are alternately rearranged by every field by a select circuit 24 is obtained and is recorded by a rotary head 30 through a recording circuit 29.
- the synthesis signal reproduced by a playback circuit 31 is delayed to form a delayed signal by a delay circuit 32.
- Each of the video signals is obtained from the synthesis signal and the delayed signal selected by a select circuit 33.
- the video information is intermittently reproduced and there is a drawback such that the reproduced image becomes unnatural.
- a method of recording all information instead of the field skip there is a method of recording a plurality of video signals by using a plurality of head pairs as disclosed in JP-A-63-280589.
- Fig. 2 shows a tape pattern based on the above method.
- a signal of the R channel is recorded by the pair of rotary heads having azimuth angles of to and a signal of the L channel is recorded by the pair of rotary heads having different azimuth angles tq).
- the recording and reproduction can be performed by a customer, when the signal on the tape recorded by such a VTR is reproduced by the conventional VTR, the signal of only one selected channel can be reproduced and there is a large problem in terms of the compatibility.
- the conventional technique as mentioned above is insufficient to record and reproduce a plurality of video signals and audio signals and is not put into practical use as a home-use VTR.
- a recording system is constructed by including a plurality of recording processing means for converting a plurality of video signals into recordable signals, a pair of first rotary heads each of which has a track width narrower than a recording track pitch and in which there is an opposite relation between gap azimuth angles and there is an angle difference of 180 between the relative positions, a second pair of rotary heads which have the same azimuth angle relation as that of the first rotary head pair and are arranged at relative positions of 180°, and means for recording a control signal synchronized with a vertical sync signal of either one of a plurality of video signals to a control track, and a reproducing system is constructed by including playback reproducing means for reconstructing reproduction signals obtained by the plurality of rotary head pairs into the original video signals and servo means for reproducing the control signal recorded on the control track and for controlling the rotary head pairs and the tape run.
- a plurality of video signals are simultaneously recorded by a plurality of rotary head pairs on a plurality of tracks formed by dividing the track pitch of the conventional VTR, and in the above case, the azimuth angles of the plurality of rotary head pairs are set to the same values as those of the conventional industrial VTRs, and the information synchronized with the vertical sync signal of either one of the video signals is recorded on the control track. Therefore, the plurality of video signals recorded can be simultaneously reproduced or selectively reproduced. Moreover, even when the tape recorded on the basis of the method of the invention is loaded into the conventional VTR, a plurality of video signals can be selectively reproduced.
- the second object of the invention is to realize a video tape recorder which can simultaneously record video and audio signals of two channels while keeping a complete compatibility with widely spread conventional home-use video tape recorders of the azimuth recording type.
- the third object of the invention is to provide a recording method in which a conventional home-use VTR can reproduce video and audio signals of a respective channel independently from the tape on which the video and audio signals of two channels have simultaneously been recorded.
- the fourth object of the invention is to provide a video tape recorder which can selectively or simultaneously reproduce video and audio signals of two channels which have simultaneously been recorded.
- Fig. 3 is a block diagram showing a fundamental construction of the invention.
- Reference numeral 1 denotes an input terminal of the channel 1; 2 a recording processor; 3 and 4 a first pair of rotary heads; 5 an input terminal of the channel 2; 8 a recording processor; 9 and 10 a second pair of rotary heads; 16 a control signal recording circuit; 17 a recording servo system; and 18 a control signal recording/playback head.
- the above component elements comprise a recording system.
- a playback system is composed of a playback amplifier 11 to select and amplify the signals from the pair of rotary heads 3 and 4, a playback amplifier 14 to select and amplify the signals of the pair of rotary heads 9 and 10, a selector 15 for switching outputs of the playback amplifiers 11 and 14, a playback processor 12, a video output terminal 13, a control signal playback amplifier 19, and a playback servo system 20.
- the relations and operations of the component elements of the VTR having the above configuration will now be described. It is now assumed that there are video signals of two channels given to the input terminals 1 and 5, respectively.
- the video signal of the first channel supplied to the input terminal 1 is subjected to necessary processes for recording by the recording processor 2.
- the above processes are substantially the same as the recording processes in the conventional home-use VTR.
- a luminance signal is subjected to processes such as emphasis, frequency modulation, and the like.
- Chrominance signals are converted into low frequency signals.
- the signal of the channel 1 transmitted through the recording processor 2 is supplied to the rotary heads 3 and 4 whose azimuth angles are set to + 0 and -0 respectively and whose track widths are narrower than a track pitch, so that the signal is recorded onto the tape in a manner similar to the conventional VTR.
- the signal of the channel 2 is subjected to processes necessary for recording by the recording processor 8. The above processes are substantially the same as those of the recording processor 2.
- the signal of the channel 2 transmitted through the recording processor 8 is supplied to be recorded to the rotary heads 9 and 10 whose azimuth angles are set to + and -0 respectively and whose track widths are narrower than the track pitch.
- control signal In the case of recording the video signals by the VTR, it is necessary to record a control signal synchronized with the video signal to a control track on the tape.
- the control signal synchronized with the video signal of the channel 2 is recorded to the control track on the tape by the control signal recording circuit 16 and the fixed control head 18.
- the control signal is used as a control signal for a playback servo system to control a cylinder and a capstan in the reproducing operation.
- the control signal bears information to synchronize with a vertical sync signal of the input video signal and functions so as to control such that a switching timing of the rotary head pair 9 and 10 is located in a vertical blanking period of the video signal, thereby preventing a fluctuation of a display picture on the screen due to the selecting section of the heads.
- the video signal of the channel 2 keeps the above relation.
- the vertical sync signal of the channel 1 is not synchronized with the control signal which is recorded by the control head 18.
- the switching between the rotary heads 3 and 4 may be performed outside of the vertical blanking portion, so that a connecting portion of the images due to the switching of the heads appears in the reproduced picture plane.
- the connecting accuracy of the head switching portion is improved so as to obtain an almost allowable picture quality, so that a sufficiently acceptable picture quality for practical use may be obtained for the video signal of the channel 1.
- the control signal can be obviously derived also from the signal of the channel 1. In such a case, the video signal of the channel 1 is completely reproduced without any connecting portion and the video signal of the channel 2 is reproduced while a small connecting portion remains on the screen.
- the signals of the channel 1 which are reproduced by the heads 3 and 4 are amplified selectively by the playback amplifier 11, so that the continuous signal is generated.
- the signals of the channel 2 which are reproduced by the heads 9 and 10 are transmitted through the playback amplifier 14 and transferred to the selector 15.
- the selector 15 selects either one of the signals of the channels 1 and 2 in accordance with a command of the user. Either selected one of the signals is subjected to reproducing processes (deemphasis, frequency demodulation, color frequency conversion, etc.) similar to those in the conventional VTR by the playback processor 12 and is provided as a playback video signal to the output terminal 13.
- the video signals of two channels can be simultaneously recorded by one VTR, and in the reproducing operation, the signal of either one of the two channels can be selected and reproduced.
- the video signals of two channels are recorded.
- the servo system of the VTR is set into the standard mode.
- the track pitch in the standard mode is equal to 58 ⁇ m and the tape feed speed is set at 3.3 cm/sec as a standard mode of the conventional VTR.
- a track width of each rotary head 3, 4, 9, or 10 is narrower than the track pitch and is set to about 25 ⁇ m which is equal to or less than 1/2 of the ordinary track pitch.
- the azimuth angles are set to to which are the same as those in the conventional VTR.
- Tp denotes a track pitch in the standard mode.
- the video signals of the channels 1 and 2 are recorded in tracks L 1 and R 2 within one track pitch by the heads 3 and 10 so as to have a track width of about 1/2 and azimuth angles of + and -0 respectively.
- the video signals of the channels 1 and 2 are recorded in tracks R 1 and L 2 by the heads 4 and 9 so as to have azimuth angles -0 and + 0 respectively.
- Respective head numbers are written in the figure under the corresponding tracks so as to easily understand the relation between the track patterns and the recording/playback heads.
- the heads 3 and 4 are mounted on the cylinder at the opposite positions which are away from each other by an angle of 180°.
- the heads 9 and 10 are also likewise mounted on the cylinder at the opposite positions which are away from each other by 180 °.
- the signals of the channel 1 are sequentially reproduced from the signals of the L 1 and R 1 tracks by the rotary heads 3 and 4, and the signals of the channel 2 from the signals of the L 2 and R 2 tracks by the rotary heads 9 and 10. Therefore, by selecting the reproduced signals of either one of the rotary head pairs, the signal of the first or second channel can be obtained.
- the foregoing control signal is recorded to another control track 71 different from the video tracks in a manner similar to the case of the conventional VTR.
- Fig. 5 shows the track patterns shown in Fig. 4 in more detail and shows a situation of reproduction by the conventional VTR.
- Two video signals of CH 1 and CH 2 are recorded by a head width (about 25 ⁇ m) smaller than 1/2 of the track pitch (58 ⁇ m) on the tracks with the standard track pitch. Those video signals are recorded in the same azimuth angle relation.
- the tracks L 1 and R 1 of the channel CH 1 and the tracks L 2 and R 2 of the channel CH 2 have guard bands 70 each having a width of 8 ⁇ m in the above case, thereby preventing the generation of a crosstalk between the same azimuth angles.
- the signals of two channels can be easily reproduced, since the recording heads and the playback heads are the same.
- a head width of the standard mode is generally set between 45 and 50 ⁇ m and is wider than 1/2 of the track pitch Tp and narrower than Tp.
- the position of the heads relating to the track pitch can be shifted by adjusting a tracking shifter for playback operation.
- the heads each having a width of 49 ⁇ m are shifted to a suitable position for tracking the signal tracks R 1 and L 1 of the CH1.
- the head 37 with the azimuth angle of -0 picks up the signal of the R 1 track but does not pick up the signal of the L 2 track whose azimuth angle is + because of the azimuth loss.
- the signal of the R 1 track of CH 1 can be reproduced by the head 37.
- the head 38, the other one of the pair, with the azimuth angle of + 0 reproduces the L 1 track but does not pick up the signal on the R 2 track.
- the signal of the L 1 track of CH 1 is reproduced by the head 38.
- the signals of the CH 1 can be selectively reproduced, even though the heads are wider than the recorded track.
- the head 39 reproduces the L 2 track and the head 40 reproduces the R 2 track, while the signals of the adjacent other tracks L 1 and R 1 are not picked up.
- the signal of the CH 2 can be reproduced.
- the track width of the heads for the long time mode is set within a range from 20 to 30 ⁇ m and meets the above conditions.
- Fig. 6 is a block diagram showing another embodiment of the invention.
- a further improved picture quality can be provided in a method of simultaneously recording video signals of two channels onto one tape.
- the head switching operation of one channel is possibly executed within an effective picture plane out of the blanking period, so that a scratch noise due to the head switching appears on the picture plane of the reproduced signal.
- the embodiment of Fig. 6 shows a configuration of a 2-channel recording and reproducing method in which the above drawback is eliminated.
- the component elements having the same functions as those in the embodiment of Fig. 3 are designated by the same reference numerals.
- Reference numeral 1 denotes the input signal terminal of the channel 1; 2 the recording processor; 3 and 4 the rotary head pair; 5 the input signal terminal of the channel 2; 41 a sync signal detector; 42 a synchronizer; 8 the recording processor; and 9 and 10 the pair of rotary heads.
- the above component elements construct the recording system together with the control signal recording circuit 16, recording servo system 17, and control signal recording/playback head 18.
- the playback system is constructed by the playback amplifier 11 for selectively amplifying the signals of the rotary head pair 3 and 4, the playback amplifier 14 for selectively amplifying the signals of the rotary head pair 9 and 10, the selector 15 for selecting the outputs of the playback amplifiers 11 and 14, playback processor 12, the output terminal 13, the control signal playback amplifier 19, and the playback servo system 20 in a manner similar to Fig. 3.
- the relations and operations of the component elements of the VTR in the above construction will now be described. It is now assumed that video signals of two channels are given to the input terminals 1 and 5, respectively.
- the video signal of the first channel supplied to the input terminal 1 is subjected to processes which are necessary for recording by the recording processor 2.
- the above processes are substantially the same as the recording processes of the conventional home-use VTR.
- the luminance signal is subjected to processes such as emphasis, frequency modulation, and the like.
- the chrominance signals are converted into low frequency signals.
- the signal of the channel 1 transmitted through the recording processor 2 is supplied to the rotary heads 3 and 4 in which azimuth angles are set to + 0 and -0 and each track width is narrower than the track pitch.
- the signal of the channel 1 is recorded onto the tape by the rotary heads 3 and 4 in a manner similar to the conventional VTR.
- the signal of the channel 2 is controlled so as to keep the synchronizing relation with the video signal of the channel 1 by the synchronizer.
- the video signal is written into a memory having a capacity of one frame by a write clock which is synchronized with the sync signal included in the video signal.
- the sync signal is detected from the signal of the channel 1 by the sync signal detector 41.
- the video signal is read out from the memory by a read clock which is synchronized with the sync signal.
- an output signal synchronized with the video signal of the channel 1 is derived.
- the signal of the channel 2 synchronized with the signal of the channel 1 derived as mentioned above is subjected to the necessary processes for recording by the recording processor 8.
- the above processes are substantially the same as those of the recording processor 2.
- the signal of the channel 2 transmitted through the recording processor 8 is supplied to the rotary heads 9 and 10 in which azimuth angles are set to + 0 and -0 and each track width is narrower than the track pitch.
- the signal of the channel 2 is recorded by the rotary heads 9 and 10.
- the input video signal of the channel 2 is synchronized with the input video signal of the channel 1, since the signal of the channel 2 also has a synchronizing relation with the same control signal which is recorded onto the control track. Therefore, the head switching position can be located in the vertical blanking period and it is possible to perform the recording and playback in which a scratch noise due to the head switching does not appear in the effective picture plane.
- the above conditions relate to the case where the rotary head pair 3 and 4 and the rotary head pair 9 and 10 are arranged at the same positions on the rotary cylinder.
- the position of the rotary head pair 3 and 4 is away from the position of the rotary head pair 9 and 10 on the cylinder, it is sufficient to shift the vertical sync signal picked up by the other rotary head pair in accordance with the distance between both of those positions.
- Such a shifting operation can be easily realized by starting the reading operation of the synchronizer 42 by a signal which is delayed by a predetermined time from the vertical sync signal of the video signal of the CHi.
- the operation is executed in substantially the same manner as that in the case of the embodiment of Fig. 3.
- the video signals of two channels recorded can be selected and reproduced on the basis of a command of the user.
- Fig. 7 shows another VTR according to the invention including a 2-channel recording and reproducing function.
- the VTR is constructed so as to realize the more perfect compatibility with the conventional home-use VTRs which are spread.
- Fig. 7 differs from Fig. 6 with respect to a point that change-over switches 45, 46, 47, and 48 are provided and the complete compatibility is maintained by having the standard recording/playback mode (SP) and the long time recording/playback mode (EP) as the conventional VTR has, in addition to the 2-channel recording mode.
- Fig. 7 also differs from Fig. 6 with regard to a point that the outputs of the playback amplifiers 11 and 14 are provided to the playback processors 12 and 49 to be respectively playback processed and the video signals of the two channels 1 and 2 are simultaneously generated.
- SP standard recording/playback mode
- EP long time recording/playback mode
- Fig. 7 also differs from Fig. 6 with regard to a point that the outputs of the playback amplifiers 11 and 14 are provided to the
- the input signal of the CH 1 is transmitted through the recording processor 2 and is recorded by the heads 3 and 4.
- the input signal of the CH 2 is transmitted through the synchronizer 42 and recording processor 8 and is recorded by the heads 9 and 10.
- those input signals are simultaneously recorded onto the tape in a form of divided halves of the track pitch of the standard mode. Therefore, as already mentioned above, the heads 9 and 10 and the heads 3 and 4 preferably have a track width of about 25 /1.m.
- the VTR When the switches 45 and 46 are connected to the EP side, the VTR is set into the long time mode, and the input video signal of the CH 1 only is supplied to the heads 3 and 4 through the recording processor 2 and is recorded at a track pitch in the EP mode.
- the rotary heads 3 and 4 are commonly used in both of the 2-channel recording/playback mode and the long time recording/playback mode.
- the track width of about 25 /1.m satisfies the above conditions.
- the switches 45 and 46 are connected to the SP side, the input video signal of the CH 1 is supplied to heads 43 and 44 through the recording processor 2 and is recorded onto the tape at a track pitch in the standard mode.
- the heads 43 and 44 have a track width of 45 to 50 /1.m.
- the input video signal of the CH 2 is not supplied to any of the heads.
- either one of the 2CH, EP and SP playback mode is selected by the switches 47 and 48. It is preferable that those switches are automatically switched on the basis of the information of a control signal and video signals on the recorded tape.
- the VTR of the invention executes playback of the tape recorded by the conventional VTR and the conventional VTR can playback the tape recorded in the SP or EP mode of the VTR of the invention without any trouble. Thus, compatibility can be maintained.
- simultaneous recording and playback of the signals of two channels which is impossible in the conventional VTR can be executed by the VTR of the invention because the VTR has two-channel recording mode. Moreover, the tape recorded in such a mode can be also reproduced by the conventional VTR. Consequently, an extremely convenient VTR is realized.
- the video tape recorder of the embodiment of the invention since the signal of the second channel is recorded between the recording tracks of the first channel, the signals of a plurality of channels are recorded on the same tape, those signals can be selectively or simultaneously reproduced, and the control signal synchronized with either one of both of the above signals is recorded. Therefore, even in another VTR, the signal of each channel on the recording tape can be selectively reproduced.
- one VTR has the standard mode, long time mode, and a plurality of channel recording mode, the more complete compatibility is accomplished.
- Fig. 8 shows a still another apparatus of the invention and is a block diagram showing a method to record video signals of two channels simultaneously and to record audio signals of two channels simultaneously in correspondence to the video signals.
- the component elements having the same functions as those described above are designated by the same reference numerals.
- the control signal system is omitted since its operation is substantially the same as that mentioned above.
- the input video signal of the CH 1 is transmitted through the recording processor 2 and is recorded by the rotary head pair 3 and 4, while the input video signal of the CH 2 is synchronized with the signal of the CH 1 by the synchronizer 42 and, thereafter, it is transmitted through the recording processor 8 and is recorded by the rotary head pair 9 and 10 in a manner similar to the case which has been described above.
- the input audio signal of the CH 1 which is given to the terminal 50 and corresponds to the input video signal of the CH 1 is amplified by the recording amplifier 51.
- a high frequency bias is applied from the bias oscillator 52.
- the resultant audio signal is recorded onto an audio track on the magnetic tape by the fixed audio head 53. Since the audio track is recorded into a region on the tape which is different from both of the video signal tracks and the control signal track, no interference with the video signals and control signal occurs.
- the audio signal of the CH 1 recorded on the audio track is reproduced by the playback amplifier 54.
- stereophonic audio signals can be also easily treated by dividing the audio track into halves and by using two audio heads.
- the input audio signals which are given to the input terminals 55 and 56 and correspond to the input video signal of the CH 2 are frequency modulated by the frequency modulators (FM) 57 and 58 by different carrier frequencies respectively. Both of the FM waves are mixed by the mixer 59, thereafter.
- the mixed signal is amplified by the recording amplifier 60 and supplied to the rotary head pair 61 and 62.
- the recording amplifier 60 Although the rotary head pair 61 and 62 commonly use the same region for the video track portion, the mixed signal is recorded into a deeper layer portion of the magnetic tape by a different azimuth angle from the video signals. Thus, the mixed signal can be recorded without any interference with the video signals.
- Such a technique has already been used in conventional home-use video cassette recorders VCR.
- reproduced signals by the rotary head pair 61 and 62 are amplified by the playback amplifier 63 and are separated into two signals corresponding to the carrier frequencies of the frequency modulated signal by the band pass filters (BPFs) 64 and 65.
- BPFs band pass filters
- the two separated signals are respectively demodulated and the audio signals of the L and R channels are provided to the terminals 68 and 69.
- the two kinds of audio signals can be also recorded and reproduced in correspondence to the video signals, the video signals accompanied with the audio signals of two channels can be simultaneously recorded and reproduced.
- signals of a plurality of channels can be simultaneously recorded and reproduced by the VTR which of the prior art can record the video and audio signals of one channel only. Therefore, since the video tape recorder may record, the video and audio signals obtained from the BS tuner to the first channel, and the video and audio signals derived from the VHF tuner to the second channel, the video tape recorder records and reproduces simultaneously even the plural programs whose broadcasting time zones overlap each other, so that the reproduced signals can be selected and the corresponding program can be played later. Thus, a loss of opportunity to watch the programs is prevented.
Abstract
Description
- The invention relates to a video tape recorder (VTR) for recording and reproducing a video signal and an audio signal and, more particularly, to a video tape recorder which can simultaneously record a plurality of video signals and audio signals onto the same tape by a single tape running mechanism and can also reproduce a desired signal.
- In recent years, the widespread of home-use VTRs is remarkable. However, when video images of a television broadcasting are recorded, it is impossible to simultaneously record video signals of a plurality of channels by one VTR. Such a drawback is felt to be further inconvenient due to the recent development of the satellite broadcasting BS and the cable television CATV.
- As a conventional method of recording a plurality of video signals by one VTR, there is a method called a field skip. For instance, there is JP-A-59-117383. Fig. 1 shows a construction of the video tape recorder of the above Official Gazette. Video signals given to
input terminals delay circuit 25 and acontrol circuit 26. A synthesis signal in which the respective input signals are alternately rearranged by every field by aselect circuit 24 is obtained and is recorded by arotary head 30 through arecording circuit 29. In the reproducing operation, the synthesis signal reproduced by aplayback circuit 31 is delayed to form a delayed signal by adelay circuit 32. Each of the video signals is obtained from the synthesis signal and the delayed signal selected by aselect circuit 33. However, in such a field skip recording, since each of the video signals is recorded every other field, the video information is intermittently reproduced and there is a drawback such that the reproduced image becomes unnatural. Even in the case of a line skip method in which the input signals are rearranged every line, there is a problem such that a vertical resolution of the reproduced image deteriorates. - As a method of recording all information instead of the field skip, there is a method of recording a plurality of video signals by using a plurality of head pairs as disclosed in JP-A-63-280589. Fig. 2 shows a tape pattern based on the above method. A signal of the R channel is recorded by the pair of rotary heads having azimuth angles of to and a signal of the L channel is recorded by the pair of rotary heads having different azimuth angles tq). In the above case, although the recording and reproduction can be performed by a customer, when the signal on the tape recorded by such a VTR is reproduced by the conventional VTR, the signal of only one selected channel can be reproduced and there is a large problem in terms of the compatibility.
- The conventional technique as mentioned above is insufficient to record and reproduce a plurality of video signals and audio signals and is not put into practical use as a home-use VTR.
- It is an object of the invention to provide a VTR which makes it possible to perform the function which cannot be realized by the conventional VTR, that is, the function such that video signals of a plurality of channels are recorded and reproduced by one VTR and a desired video signal recorded on a tape by the VTR according to the invention can be also reproduced by a conventional home-use VTR, thereby keeping the compatibility with widely spread home-use VTRs and corresponding to an increasing variation of input sources.
- To accomplish the above object, according to a video tape recorder of the invention, a recording system is constructed by including a plurality of recording processing means for converting a plurality of video signals into recordable signals, a pair of first rotary heads each of which has a track width narrower than a recording track pitch and in which there is an opposite relation between gap azimuth angles and there is an angle difference of 180 between the relative positions, a second pair of rotary heads which have the same azimuth angle relation as that of the first rotary head pair and are arranged at relative positions of 180°, and means for recording a control signal synchronized with a vertical sync signal of either one of a plurality of video signals to a control track, and a reproducing system is constructed by including playback reproducing means for reconstructing reproduction signals obtained by the plurality of rotary head pairs into the original video signals and servo means for reproducing the control signal recorded on the control track and for controlling the rotary head pairs and the tape run.
- With the above construction of the invention, a plurality of video signals are simultaneously recorded by a plurality of rotary head pairs on a plurality of tracks formed by dividing the track pitch of the conventional VTR, and in the above case, the azimuth angles of the plurality of rotary head pairs are set to the same values as those of the conventional industrial VTRs, and the information synchronized with the vertical sync signal of either one of the video signals is recorded on the control track. Therefore, the plurality of video signals recorded can be simultaneously reproduced or selectively reproduced. Moreover, even when the tape recorded on the basis of the method of the invention is loaded into the conventional VTR, a plurality of video signals can be selectively reproduced.
- Accordingly, it is the first object of the invention to enable a plurality of video and audio signals to be simultaneously recorded onto the same tape by a single mechanism.
- The second object of the invention is to realize a video tape recorder which can simultaneously record video and audio signals of two channels while keeping a complete compatibility with widely spread conventional home-use video tape recorders of the azimuth recording type.
- The third object of the invention is to provide a recording method in which a conventional home-use VTR can reproduce video and audio signals of a respective channel independently from the tape on which the video and audio signals of two channels have simultaneously been recorded.
- The fourth object of the invention is to provide a video tape recorder which can selectively or simultaneously reproduce video and audio signals of two channels which have simultaneously been recorded.
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- Fig. 1 is a block diagram of a conventional recording and reproducing apparatus recording video signals of two channels by one video tape recorder;
- Fig. 2 is a diagram showing a tape format in a conventional recording and reproducing apparatus recording a plurality of video signals to a plurality of video tracks;
- Fig. 3 is a block diagram showing a basic configuration of a recording and reproducing apparatus of the invention illustrating a circuit to record video signals of two channels simultaneously and a circuit to selectively reproduce the video signals of two channels used in a video tape recorder;
- Fig. 4 is a relational diagram between tape recording patterns and azimuth angles of recording and reproducing heads showing the fundamental principle of the invention;
- Fig. 5 is a diagram showing the details of tape recording patterns based on the invention and a positional relation of heads in the case of reproducing by the conventional video tape recorder;
- Fig. 6 is a block diagram showing a configuration of another recording and reproducing apparatus of the invention which can obtain a further improved picture quality;
- Fig. 7 is a block diagram showing a configuration of a further recording and reproducing apparatus of the invention applied to a video tape recorder enabling signals of two channels to be simultaneously reproduced and having a complete compatibility with the conventional home-use VTR; and
- Fig. 8 is a block diagram of a still another recording and reproducing apparatus of the invention recording and reproducing not only video signals of two channels but also an audio signal added to each video signal.
- Embodiments of the invention will be described hereinbelow with reference to the drawings. Fig. 3 is a block diagram showing a fundamental construction of the invention.
Reference numeral 1 denotes an input terminal of thechannel 1; 2 a recording processor; 3 and 4 a first pair of rotary heads; 5 an input terminal of thechannel 2; 8 a recording processor; 9 and 10 a second pair of rotary heads; 16 a control signal recording circuit; 17 a recording servo system; and 18 a control signal recording/playback head. The above component elements comprise a recording system. A playback system is composed of a playback amplifier 11 to select and amplify the signals from the pair ofrotary heads playback amplifier 14 to select and amplify the signals of the pair ofrotary heads selector 15 for switching outputs of theplayback amplifiers 11 and 14, aplayback processor 12, avideo output terminal 13, a controlsignal playback amplifier 19, and aplayback servo system 20. - The relations and operations of the component elements of the VTR having the above configuration will now be described. It is now assumed that there are video signals of two channels given to the
input terminals 1 and 5, respectively. The video signal of the first channel supplied to theinput terminal 1 is subjected to necessary processes for recording by therecording processor 2. The above processes are substantially the same as the recording processes in the conventional home-use VTR. A luminance signal is subjected to processes such as emphasis, frequency modulation, and the like. Chrominance signals are converted into low frequency signals. The signal of thechannel 1 transmitted through therecording processor 2 is supplied to therotary heads channel 2 is subjected to processes necessary for recording by therecording processor 8. The above processes are substantially the same as those of therecording processor 2. The signal of thechannel 2 transmitted through therecording processor 8 is supplied to be recorded to therotary heads channel 2 is recorded to the control track on the tape by the controlsignal recording circuit 16 and thefixed control head 18. The control signal is used as a control signal for a playback servo system to control a cylinder and a capstan in the reproducing operation. The control signal bears information to synchronize with a vertical sync signal of the input video signal and functions so as to control such that a switching timing of therotary head pair channel 2 keeps the above relation. However, since the video signal of thechannel 1 is ordinarily not synchronized with the video signal of thechannel 2, the vertical sync signal of thechannel 1 is not synchronized with the control signal which is recorded by thecontrol head 18. Therefore, the switching between therotary heads channel 1. The control signal can be obviously derived also from the signal of thechannel 1. In such a case, the video signal of thechannel 1 is completely reproduced without any connecting portion and the video signal of thechannel 2 is reproduced while a small connecting portion remains on the screen. - Consideration is made so as not to overlap the tracks on the tape which are recorded by the
heads - In the reproducing system, the signals of the
channel 1 which are reproduced by theheads channel 2 which are reproduced by theheads playback amplifier 14 and transferred to theselector 15. Theselector 15 selects either one of the signals of thechannels playback processor 12 and is provided as a playback video signal to theoutput terminal 13. According to the embodiment of Fig. 3 as mentioned above, the video signals of two channels can be simultaneously recorded by one VTR, and in the reproducing operation, the signal of either one of the two channels can be selected and reproduced. - The recording tracks on the tape by the rotary heads 3, 4, 9, and 10 will now be described.
- In the embodiment of Fig. 3, the video signals of two channels are recorded. In this case, the servo system of the VTR is set into the standard mode. For instance, in the VHS-VTR, the track pitch in the standard mode is equal to 58 µm and the tape feed speed is set at 3.3 cm/sec as a standard mode of the conventional VTR. A track width of each
rotary head channels heads channels heads heads heads - As for the tape recorded by such track patterns, in the reproducing operation, with the servo system set at the standard mode, the signals of the
channel 1 are sequentially reproduced from the signals of the L1 and R1 tracks by the rotary heads 3 and 4, and the signals of thechannel 2 from the signals of the L2 and R2 tracks by the rotary heads 9 and 10. Therefore, by selecting the reproduced signals of either one of the rotary head pairs, the signal of the first or second channel can be obtained. The foregoing control signal is recorded to anothercontrol track 71 different from the video tracks in a manner similar to the case of the conventional VTR. - Fig. 5 shows the track patterns shown in Fig. 4 in more detail and shows a situation of reproduction by the conventional VTR. Two video signals of CH1 and CH2 are recorded by a head width (about 25 µm) smaller than 1/2 of the track pitch (58 µm) on the tracks with the standard track pitch. Those video signals are recorded in the same azimuth angle relation. The tracks L1 and R1 of the channel CH1 and the tracks L2 and R2 of the channel CH2 have
guard bands 70 each having a width of 8 µm in the above case, thereby preventing the generation of a crosstalk between the same azimuth angles. In the case where the same apparatus reproduces the tape recorded as mentioned above, the signals of two channels can be easily reproduced, since the recording heads and the playback heads are the same. - A situation in the case where a conventional VTR reproduces the tape having the track patterns recorded as mentioned above will now be described. In the conventional VTR, a head width of the standard mode is generally set between 45 and 50 µm and is wider than 1/2 of the track pitch Tp and narrower than Tp. The position of the heads relating to the track pitch can be shifted by adjusting a tracking shifter for playback operation. In the CH1 playback operation shown in Fig. 5, the heads each having a width of 49 µm are shifted to a suitable position for tracking the signal tracks R1 and L1 of the CH1. For example, the
head 37 with the azimuth angle of -0 picks up the signal of the R1 track but does not pick up the signal of the L2 track whose azimuth angle is + because of the azimuth loss. Thus, the signal of the R1 track of CH1 can be reproduced by thehead 37. Thehead 38, the other one of the pair, with the azimuth angle of + 0 reproduces the L1 track but does not pick up the signal on the R2 track. Thus, the signal of the L1 track of CH1 is reproduced by thehead 38. As mentioned above, since the playback heads are shifted to the playback position for the CH1 by the tracking shifter, the signals of the CH1 can be selectively reproduced, even though the heads are wider than the recorded track. On the contrary, when the pair of rotary heads are moved to the playback position for the CH2 by the tracking shifter, thehead 39 reproduces the L2 track and thehead 40 reproduces the R2 track, while the signals of the adjacent other tracks L1 and R1 are not picked up. Thus, the signal of the CH2 can be reproduced. When the recording tape patterns are set as in the embodiment mentioned above, the video signals of two channels can be selected and reproduced also by the conventional VTR. Thus, the compatibility with the conventional VTR can be assured. - In the embodiment, it is also possible to easily construct one of two pairs of rotary heads to be commonly used for the conventional type of a long recording time mode. In the case of the VHS-VTR, the track width of the heads for the long time mode is set within a range from 20 to 30 µm and meets the above conditions. With the above construction, it is sufficient to modify the VTR to a Z-channel recording type by adding only a pair of rotary heads and it is economical.
- Fig. 6 is a block diagram showing another embodiment of the invention. In this embodiment, a further improved picture quality can be provided in a method of simultaneously recording video signals of two channels onto one tape. In the first embodiment shown in Fig. 3, when two input video signals are not synchronized, the head switching operation of one channel is possibly executed within an effective picture plane out of the blanking period, so that a scratch noise due to the head switching appears on the picture plane of the reproduced signal. The embodiment of Fig. 6 shows a configuration of a 2-channel recording and reproducing method in which the above drawback is eliminated. In Fig. 6, the component elements having the same functions as those in the embodiment of Fig. 3 are designated by the same reference numerals.
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Reference numeral 1 denotes the input signal terminal of thechannel 1; 2 the recording processor; 3 and 4 the rotary head pair; 5 the input signal terminal of thechannel 2; 41 a sync signal detector; 42 a synchronizer; 8 the recording processor; and 9 and 10 the pair of rotary heads. The above component elements construct the recording system together with the controlsignal recording circuit 16,recording servo system 17, and control signal recording/playback head 18. The playback system is constructed by the playback amplifier 11 for selectively amplifying the signals of therotary head pair playback amplifier 14 for selectively amplifying the signals of therotary head pair selector 15 for selecting the outputs of theplayback amplifiers 11 and 14,playback processor 12, theoutput terminal 13, the controlsignal playback amplifier 19, and theplayback servo system 20 in a manner similar to Fig. 3. - The relations and operations of the component elements of the VTR in the above construction will now be described. It is now assumed that video signals of two channels are given to the
input terminals 1 and 5, respectively. The video signal of the first channel supplied to theinput terminal 1 is subjected to processes which are necessary for recording by therecording processor 2. The above processes are substantially the same as the recording processes of the conventional home-use VTR. The luminance signal is subjected to processes such as emphasis, frequency modulation, and the like. The chrominance signals are converted into low frequency signals. The signal of thechannel 1 transmitted through therecording processor 2 is supplied to the rotary heads 3 and 4 in which azimuth angles are set to + 0 and -0 and each track width is narrower than the track pitch. The signal of thechannel 1 is recorded onto the tape by the rotary heads 3 and 4 in a manner similar to the conventional VTR. On the other hand, the signal of thechannel 2 is controlled so as to keep the synchronizing relation with the video signal of thechannel 1 by the synchronizer. In operation, for instance, the video signal is written into a memory having a capacity of one frame by a write clock which is synchronized with the sync signal included in the video signal. The sync signal is detected from the signal of thechannel 1 by thesync signal detector 41. The video signal is read out from the memory by a read clock which is synchronized with the sync signal. Thus, an output signal synchronized with the video signal of thechannel 1 is derived. The signal of thechannel 2 synchronized with the signal of thechannel 1 derived as mentioned above is subjected to the necessary processes for recording by therecording processor 8. The above processes are substantially the same as those of therecording processor 2. The signal of thechannel 2 transmitted through therecording processor 8 is supplied to the rotary heads 9 and 10 in which azimuth angles are set to + 0 and -0 and each track width is narrower than the track pitch. The signal of thechannel 2 is recorded by the rotary heads 9 and 10. In the case of recording the video signals by the VTR, it is necessary to record the control signal synchronized with the video signal onto the control track on the tape. In such a case, since only one control signal can be recorded when two video signals are recorded, both of the video signals are synchronized with the common control signal recorded as mentioned above. - Thus, the input video signal of the
channel 2 is synchronized with the input video signal of thechannel 1, since the signal of thechannel 2 also has a synchronizing relation with the same control signal which is recorded onto the control track. Therefore, the head switching position can be located in the vertical blanking period and it is possible to perform the recording and playback in which a scratch noise due to the head switching does not appear in the effective picture plane. - The above conditions relate to the case where the
rotary head pair rotary head pair rotary head pair rotary head pair synchronizer 42 by a signal which is delayed by a predetermined time from the vertical sync signal of the video signal of the CHi. - As for the playback system, the operation is executed in substantially the same manner as that in the case of the embodiment of Fig. 3. The video signals of two channels recorded can be selected and reproduced on the basis of a command of the user.
- Fig. 7 shows another VTR according to the invention including a 2-channel recording and reproducing function. The VTR is constructed so as to realize the more perfect compatibility with the conventional home-use VTRs which are spread. Fig. 7 differs from Fig. 6 with respect to a point that change-over
switches playback amplifiers 11 and 14 are provided to theplayback processors channels - In the embodiment of Fig. 7, when the
switches recording processor 2 and is recorded by theheads synchronizer 42 andrecording processor 8 and is recorded by theheads heads heads switches heads recording processor 2 and is recorded at a track pitch in the EP mode. The rotary heads 3 and 4 are commonly used in both of the 2-channel recording/playback mode and the long time recording/playback mode. The track width of about 25 /1.m satisfies the above conditions. When theswitches heads recording processor 2 and is recorded onto the tape at a track pitch in the standard mode. Theheads switches - According to the video tape recorder of the embodiment of the invention as mentioned above, since the signal of the second channel is recorded between the recording tracks of the first channel, the signals of a plurality of channels are recorded on the same tape, those signals can be selectively or simultaneously reproduced, and the control signal synchronized with either one of both of the above signals is recorded. Therefore, even in another VTR, the signal of each channel on the recording tape can be selectively reproduced. When one VTR has the standard mode, long time mode, and a plurality of channel recording mode, the more complete compatibility is accomplished.
- Fig. 8 shows a still another apparatus of the invention and is a block diagram showing a method to record video signals of two channels simultaneously and to record audio signals of two channels simultaneously in correspondence to the video signals. In Fig. 8, the component elements having the same functions as those described above are designated by the same reference numerals. The control signal system is omitted since its operation is substantially the same as that mentioned above.
- The input video signal of the CH1 is transmitted through the
recording processor 2 and is recorded by therotary head pair synchronizer 42 and, thereafter, it is transmitted through therecording processor 8 and is recorded by therotary head pair - The input audio signal of the CH1 which is given to the terminal 50 and corresponds to the input video signal of the CH1 is amplified by the
recording amplifier 51. A high frequency bias is applied from thebias oscillator 52. After that, the resultant audio signal is recorded onto an audio track on the magnetic tape by the fixedaudio head 53. Since the audio track is recorded into a region on the tape which is different from both of the video signal tracks and the control signal track, no interference with the video signals and control signal occurs. In the playback operation, the audio signal of the CH1 recorded on the audio track is reproduced by theplayback amplifier 54. - Although the audio signal has been described as monaural here, stereophonic audio signals can be also easily treated by dividing the audio track into halves and by using two audio heads.
- The input audio signals which are given to the
input terminals mixer 59, thereafter. The mixed signal is amplified by therecording amplifier 60 and supplied to therotary head pair 61 and 62. On the magnetic tape, although therotary head pair 61 and 62 commonly use the same region for the video track portion, the mixed signal is recorded into a deeper layer portion of the magnetic tape by a different azimuth angle from the video signals. Thus, the mixed signal can be recorded without any interference with the video signals. Such a technique has already been used in conventional home-use video cassette recorders VCR. - In the playback operation, reproduced signals by the
rotary head pair 61 and 62 are amplified by theplayback amplifier 63 and are separated into two signals corresponding to the carrier frequencies of the frequency modulated signal by the band pass filters (BPFs) 64 and 65. The two separated signals are respectively demodulated and the audio signals of the L and R channels are provided to theterminals - As mentioned above, since the two kinds of audio signals can be also recorded and reproduced in correspondence to the video signals, the video signals accompanied with the audio signals of two channels can be simultaneously recorded and reproduced.
- As will be obviously understood from the above description, according to the invention, signals of a plurality of channels can be simultaneously recorded and reproduced by the VTR which of the prior art can record the video and audio signals of one channel only. Therefore, since the video tape recorder may record, the video and audio signals obtained from the BS tuner to the first channel, and the video and audio signals derived from the VHF tuner to the second channel, the video tape recorder records and reproduces simultaneously even the plural programs whose broadcasting time zones overlap each other, so that the reproduced signals can be selected and the corresponding program can be played later. Thus, a loss of opportunity to watch the programs is prevented.
Claims (8)
Applications Claiming Priority (6)
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JP3003193A JPH04241588A (en) | 1991-01-16 | 1991-01-16 | Recording and reproducing device for plural channel video signals |
JP3193/91 | 1991-01-16 | ||
JP3151387A JPH04373378A (en) | 1991-06-24 | 1991-06-24 | Magnetic recording and reproducing device |
JP151387/91 | 1991-06-24 | ||
JP3289668A JPH05130547A (en) | 1991-11-06 | 1991-11-06 | Multiple video signal recording and reproducing device |
JP289668/91 | 1991-11-06 |
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EP0495480A2 true EP0495480A2 (en) | 1992-07-22 |
EP0495480A3 EP0495480A3 (en) | 1993-06-09 |
EP0495480B1 EP0495480B1 (en) | 1996-10-02 |
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EP92100601A Expired - Lifetime EP0495480B1 (en) | 1991-01-16 | 1992-01-15 | Video tape recorder for multi-channel recording |
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EP (1) | EP0495480B1 (en) |
KR (1) | KR960004322B1 (en) |
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- 1992-01-15 EP EP92100601A patent/EP0495480B1/en not_active Expired - Lifetime
- 1992-01-15 KR KR1019920000470A patent/KR960004322B1/en not_active IP Right Cessation
- 1992-01-15 ES ES92100601T patent/ES2092583T3/en not_active Expired - Lifetime
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1993
- 1993-12-30 US US08/175,677 patent/US5398138A/en not_active Expired - Lifetime
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Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0598184A2 (en) * | 1992-11-18 | 1994-05-25 | Kabushiki Kaisha Toshiba | Multisystem signal processing and recording/reproducing apparatus |
EP0598184A3 (en) * | 1992-11-18 | 1995-09-27 | Toshiba Kk | Multisystem signal processing and recording/reproducing apparatus. |
US5561608A (en) * | 1992-11-18 | 1996-10-01 | Kabushiki Kaisha Toshiba | Multisystem adaptable type signal processing and recording/reproducing apparatus |
US5784526A (en) * | 1992-11-18 | 1998-07-21 | Kabushiki Kaisha Toshiba | Multisystem signal processing apparatus having specific hierarchical coding |
WO1995009509A1 (en) * | 1993-09-28 | 1995-04-06 | Kabushiki Kaisha Toshiba | Multiple program digital video recording and playback system and method |
US5619335A (en) * | 1993-09-28 | 1997-04-08 | Kabushiki Kaisha Toshiba | Digital video recording and playback system and method having multiple playback devices outputting video program data on multiple channels |
WO1995016985A1 (en) * | 1993-12-13 | 1995-06-22 | Philips Electronics N.V. | Information track format and reading and recording apparatuses therefor |
US5606465A (en) * | 1993-12-13 | 1997-02-25 | U.S. Philips Corporation | Information track format and reading and recording apparatuses therefor |
EP0753964A1 (en) * | 1995-07-13 | 1997-01-15 | THOMSON multimedia | Procedure and device for recording and reproducing, comprising a high capacity recording carrier |
FR2736783A1 (en) * | 1995-07-13 | 1997-01-17 | Thomson Multimedia Sa | METHOD AND APPARATUS FOR RECORDING AND READING WITH A HIGH CAPACITY RECORDING MEDIUM |
Also Published As
Publication number | Publication date |
---|---|
DE69214172D1 (en) | 1996-11-07 |
EP0495480B1 (en) | 1996-10-02 |
EP0495480A3 (en) | 1993-06-09 |
DE69214172T2 (en) | 1997-03-27 |
US5398138A (en) | 1995-03-14 |
KR960004322B1 (en) | 1996-03-30 |
ES2092583T3 (en) | 1996-12-01 |
KR920015907A (en) | 1992-08-27 |
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